Phonograph-record.



0. c. SCHROEDER. PHONOGRAPH RECORD. APPLICATION FILED AljG.23. 19H.

Patented Oct. 23, 1917.

mama? anvwwboz @Z@ 63 50% ZOii -Detroit, in the county of Wayne and s raan OTTO CARL SCI-IROEDER, OlF' DETROIT, MICHIGAN.

PHONOGRAPH-RECORD.

mas er.

To all whom it may concern:

Be it known that I, OTTO C. SoHRonDnR, acitizen of the United States, residin at tate of Michigan, have invented certain new and "useful Improvements in Phonograph-Records; andI do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. g

This invention relatesgenerally to acoustics and more particularly to certain new and useful improvements in phonograph records.

In the common form of phonograph records, little difliculty is experienced-inv reproducing the voices of comparatively, loud singers and the music from comparatively loud instruments, but great difiiculty is experienced where the sound to be reproduced is weak. This has been overcome to some extent by using loud toned needles, but the results obtained by using them are not as satisfactory as is desired.

It is the object of this invention to provide a means for greatly magnifying the reproductionofthe sound made by a'singer having an extremely weak voice or an instrument having an extremely weak tone, and to'this end it consists of a specially constructed phonograph record provided with (.an internal sound box.

Another object of the invention is to provide a device of this character which will be simple, strong, durable and inexpensive in construction, eificient and reliable in operation, and well adapted to the purpose for which it is designed' With these and numerous other objects in view, the invention consists of certain novel features of construction, and the combination and arrangement of parts as will behereinafter fully described and claimed.

In the accompanying drawings forming a part of the application, and in which similar reference characters are used to designate like parts throughout the several views Figure 1 is a plan view partly broken away and in section, of" one form of phonograph record constructed in accordance with this invention;,

Fig. 2 is a transverse sectional. view of the record taken on the line 2--2 of Fig. l;

inand Specification of Letters Patent.

Patented Oct. 23, 1917.

' Application filed August 23, 1917. Serial No. 187,862.

Fig. 3 is a similar view of a slightly modified form.

"Referring more particularly to the drawings, the numeral 1 represents a hollow sound box which is preferably made from aluminum or other metal annular plates 2 and 3 arranged in coincident and spaced relation and having their inner and outer edges bent toward each other and crimped or otherwise connected together as at 4. Although it is not absolutely essential, yet it is preferable to provide each of the plates 2 and 3 with a plurality of indentations or other roughened portions 5 on their outer sides.

Molded around the sound box 1 in anying 6 is shown as being preferably fiat onboth of its sides, it being of greater thickness at its central portion than at other places. Around the outer edge of the record are formed a plurality of apertures 8 which lead intothe sound box 1 from the exterior of the record.

In Fig. 3 of the drawings the record is shown as being provided with the apertures 8 around its outer edge, but is also shown as being provided with apertures 9 which lead from the exterior of the record to the sound box 1 through the inner edge of the same, .the coating (5 being in this case reduced in thickness as at 10 at its central portion to form in effect a Web.

By having the sound box disposed within the interior Oftllc record, the sound produced by the same will be greatly magnified, and hence the voice of a weak singer or the music from a weak instrument may be reproduced so as to obtain all the qualities of the sound.

It is obvious that numerous changes in form, proportion and in the minor details of construction may be resorted to without this invention an lil'iqllfi it do not Wish to be limited to the construction iiorein shown and de- 5 claim:

i, K loud tone plionograpliic reoorcl hava in the into/riot tlxorooi' which acts in the capacity of it sound box.

2. A low tone plion mphio reoorol lmvm ing 21 hollow metallic sound box disposed within the, ll'l'tQifiOI thereof.

.1 loud tone phonographio record has r a ioilow sormcl. box disposed Within the C 1161, i, a. )lionographio iscoriia w lioliow metallic sound i001: disposed thin interim: thorsojlt' and osing "92:0- WltiSil with n pl l'itllliy of apertures zit outer amigo leadin into sairl sound box,

5. A loud tone phonographio reord hawing a, hollow sound box disposed Within the interior thereof, said sound box being composed of a pair of spaced metallic annular plates having their inner and outer edges sooured together and said record having a plurality of apertures at its nner and outer edge 7 said apertures leading into said sound box, I i

6, it loud. tone phonographic record com-,-

prising a hollow metallic sound box having indentations on its opposite s iolos and a composition coating-molded around said sound box said coating filling the indentations in v lfn. testimony Wl'lQXGOf it have liorounto set my hatocl in the presence of two subscribing Witnesses 4 @TT'G CARL SGHRUEDER.

Viitnosses:

THROW KQLRE,

B. VAN SLEMEROUQK.

said sound box for anchoring the former to too trot. 

